A federal judge sentenced four men to prison on Tuesday for helping recruit young men in Minnesota to travel to Somalia and fight for the militant group al Shabaab. _0"> Investigators believe about 20 young, ethnic Somali men left Minnesota from 2007 to 2009 to go to Somalia to fight for al Shabaab, which the United States designated a terrorist organization. Three men who cooperated with investigators were each sentenced to three years and a fourth man was sentenced to 12 years in prison. "These defendants, by providing material support to a designated terrorist organization, broke both the law and the hearts of family members across the Twin Cities," U.S. Attorney B. Todd Jones said in a statement. Eighteen men were charged after a four-year investigation. Eight were convicted and the rest are thought to be fugitives or to have been killed in Somalia while fighting for al Shabaab. On Tuesday, Omer Abdi Mohamed, 28, was sentenced to 12 years in prison after